设计模式-建造者模式

适用情境:创建复杂对象,使用单独类指导对象的创建.

// product.h
#ifndef PRODUCT_H
#define PRODUCT_H

class Product
{
public:
    Product();
    virtual void Show();
public:
    int m_iNumA;
    int m_iNumB;
};

#endif // PRODUCT_H

// product.cpp
#include "product.h"
#include <iostream>

Product::Product()
{}

void Product::Show()
{
    std::cout << "product show..."<< m_iNumA << " "<< m_iNumB << std::endl;
}

// build.h
#ifndef BUILDER_H
#define BUILDER_H

#include "product.h"

class Builder
{
public:
    Builder();
    virtual void BuilderMethodA() = 0;
    virtual void BuilderMethodB() = 0;
    virtual Product * GetProduct() = 0;
};

#endif // BUILDER_H

// builder.cpp
#include "builder.h"

Builder::Builder()
{}

// concretebuilder.h
#ifndef CONCRETEBUILDER_H
#define CONCRETEBUILDER_H

#include "builder.h"
#include "product.h"

class ConcreteBuilder : public Builder
{
public:
    ConcreteBuilder();
    ~ConcreteBuilder();
    virtual void BuilderMethodA();
    virtual void BuilderMethodB();
    virtual Product *GetProduct();
private:
    Product *m_product;
};

#endif // CONCRETEBUILDER_H

// concretebuilder.cpp
#include "concretebuilder.h"
#include <iostream>

ConcreteBuilder::ConcreteBuilder()
{
    m_product = new Product();
}

ConcreteBuilder::~ConcreteBuilder()
{
    delete m_product;
}

void ConcreteBuilder::BuilderMethodA()
{
    m_product->m_iNumA = 111;
}

void ConcreteBuilder::BuilderMethodB()
{
    m_product->m_iNumB = 222;
}

Product * ConcreteBuilder::GetProduct()
{
    return m_product;
}

// director.h
#ifndef DIRECTOR_H
#define DIRECTOR_H

#include "builder.h"

class Director
{
public:
    Director();
    virtual void Construct(Builder *builder);
};

#endif // DIRECTOR_H

// director.cpp
#include "director.h"

Director::Director()
{}

void Director::Construct(Builder *builder)
{
    builder->BuilderMethodA();
    builder->BuilderMethodB();
}

// main.cpp
#include <iostream>

#include "director.h"
#include "concretebuilder.h"
#include "product.h"

using namespace std;

int main(int argc, char *argv[])
{
    Director *director = new Director();
    Builder *builder = new ConcreteBuilder();

    director->Construct(builder);
    Product *product = builder->GetProduct();
    product->Show();

    return 0;
}